test: update test applications and test cases for singleton pattern changes

- Update BranchTest to work with simplified singleton pattern
- Update CustomBranchApp in TestBed to use getInstance() method
- Clean up MainActivity test code
- Update BranchWrapper in automation testbed to align with API changes
- Ensure all test applications continue to work after API simplification

Author: wpinho-branch

Branch-SDK-Automation-TestBed/src/main/java/io/branch/branchandroiddemo/BranchWrapper.java

@@ -131,8 +131,8 @@ public void delayInitializationIfRequired(Intent intent){
         if (testDataStr != null) {
             TestData testDataObj = new TestData();
             Boolean delayInit = testDataObj.getBoolParamValue(testDataStr, "DelayInitialization");
-            if (    delayInit) {
-                // Branch.expectDelayedSessionInitialization(true);
+            if (delayInit) {
+                // Removed deprecated methods
             }
         }
     }

Branch-SDK-TestBed/src/main/java/io/branch/branchandroidtestbed/CustomBranchApp.java

@@ -26,7 +26,7 @@ public void onCreate() {
 //            saveLogToFile(message);
 //        };
         Branch.enableLogging(BranchLogger.BranchLogLevel.VERBOSE);
-        Branch.getAutoInstance(this);
+        Branch.getInstance();
         CustomTabsIntent customTabsIntent = new CustomTabsIntent.Builder()
                 .setColorScheme(COLOR_SCHEME_DARK)
                 .build();

Branch-SDK-TestBed/src/main/java/io/branch/branchandroidtestbed/MainActivity.java

@@ -575,7 +575,6 @@ public void onFailure(Exception e) {
             public void onClick(View v) {
                 Branch.getInstance().logout();
                 Toast.makeText(getApplicationContext(), "Logged Out", Toast.LENGTH_LONG).show();
-
             }
         });
 

Branch-SDK/src/androidTest/java/io/branch/referral/BranchTest.java

@@ -85,9 +85,9 @@ protected void initBranchInstance(String branchKey) {
         Branch.enableLogging();
 
         if (branchKey == null) {
-            branch = Branch.getAutoInstance(getTestContext());
+            branch = Branch.getInstance();
         } else {
-            branch = Branch.getAutoInstance(getTestContext(), branchKey);
+            branch = Branch.getInstance();
         }
         Assert.assertEquals(branch, Branch.getInstance());